Question about Pontiac Grand Am
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Posted on Jan 02, 2017
The spark plugs are under a black plastic coil pack on top of valve cover be careful not to break it it is kinda fragile and expensive good luck
Posted on Dec 15, 2008
On the 3.1 and 4.3 V6 remove the windshield wiper module cover and rotate the engine for service access to the rear spark plugs. You can rotate the engine by disconnecting the two dog bone engine mounts and push the car forward with a friend then place the emergency brakes to keep the car from moving back and place a wheel chuck just to make sure the car is not going to move. Don't want to loose an arm. Good luck and hoe this helps and be careful not to over rotate the engine in to the radiator.
I had a 96 grand am 3.1 liter, and I don't need to remove the alternator to change the rear 3 plugs. What I do is remove the small air duct running from the alternator to where the hood meets the windshield. It should come off pretty easily. It has rubber ends which slide onto the alternator, and the vent by the windshield that it hooks up to. After that, disconnect all of the electrical plugs that meet up around the same spot that the air duct was and move them out of the way. In my experience, this has provided me with enough room to get a ratchet in there and remove the plugs. Make sure you use a spark plug socket has a rubber grip on it to hold on to the plug while you position it. If you don't do this, you will likely end up dropping the plug into the little area surrounding the plug hole, and it takes forever to get it out to try again. Also, when removing the old plugs, try to remember the angle that they went in on because you can't really see back there. It makes it a lot easier when inserting the new plugs if you get in there at the correct angle. This is for the person who it tinny and get in to different body positions.
Posted on Jul 09, 2009
A code “multiple misfire” may mean that one or more of the following has happened:
•Faulty spark plugs or wires
•Faulty coil (pack)
•Faulty oxygen sensor(s)
•Faulty fuel injector(s)
•Burned exhaust valve
•Faulty catalytic converter(s)
•Stuck/blocked EGR valve / passages
•Faulty camshaft position sensor
If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.
Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0300 code. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is stuck open.
Posted on Feb 01, 2010
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